Basic principle and stages of surgical intervention
Surgical treatment of an incarcerated hernia requires a strict sequence of actions aimed at preventing severe complications.
Key stages of the operation:
- Isolation of the operative field. Before opening the tissues, the wound area must be thoroughly packed with gauze sponges. The main goal of this maneuver is to avoid contaminating the clean wound with so-called «herniated water» (toxic exudate accumulating inside).
- Opening and fixation. The surgeon incises the hernia sac and immediately grasps the incarcerated organ with their fingers. Firm fixation is necessary to prevent the organ from accidentally slipping back into the abdomen before it can be thoroughly examined.
- Decompression. Only after secure fixation of the organ does the surgeon divide the constricting ring, relieving pressure on the tissues.
- Revision (inspection). The organ is partially exteriorized for visual assessment. Particular caution must be exercised when retrograde incarceration (retrograde incarceration) is suspected. If several bowel loops are trapped in the hernia orifice, the surgeon is obligated to bring out and inspect adjacent segments from the abdominal cavity. This is done to avoid missing non-viable fragments hidden within the abdomen.
Assessment of incarcerated bowel viability
After performing decompression, the physician must decide the fate of the organ. To do this, a number of visual and functional parameters are evaluated.
Viability criteria (Norma):
- Color: tissues recover a normal pink hue.
- Edema: gradually decreases and subsides.
- Serous coat: appears smooth and retains its natural moist sheen.
- Peristalsis: appears, and active contractions of the bowel wall are observed.
- Mesenteric vessels: their pulsation is clearly defined.
Non-viability criteria (Necrosis): If the organ has undergone irreversible necrosis, its color turns bluish-purple. Pulsation in the vessels of the feeding mesentery is completely absent, and peristaltic waves do not recover even after complete release from compression.
Tactics for questionable viability
Quite often, after dividing the ring, the status of the organ remains borderline, and viability is unclear. In such situations, rushing to conclusions is strictly forbidden—a special test is performed.
Action algorithm:
- The exteriorized bowel loop is carefully wrapped in sponges abundantly soaked in warm isotonic sodium chloride solution.
- In this state, the tissues are left right in the surgical wound for 20–30 minutes.
- After the time has elapsed, a final evaluation is performed.
If the bowel fails to turn pink and peristalsis does not start, irreversible ischemia is diagnosed—resection is indicated. If signs of life have fully recovered (color has returned, vascular pulsation has appeared), the bowel is considered healthy and gently returned to the abdominal cavity.
Resection rules and completion of surgery
If the organ is deemed dead or doubts about its integrity persist even after the warming test, the surgeon proceeds to remove the affected tissues.
Features of resection of various structures:
- Incarcerated omentum: subject to removal always, regardless of the degree of its visual damage.
- Bowel: resection is indicated for obvious necrosis or insufficient confidence in viability. The operation is always performed strictly within healthy tissues.
To ensure the reliability of the anastomosis, clear resection margins are observed (measured from the visible boundary of incarceration):
- On the afferent loop (afferent loop), it is necessary to measure back 30–40 cm.
- On the efferent loop (efferent loop), they measure back less — 15–20 cm.
Intestinal surgery ends with the creation of an entero-enteral anastomosis.
End of surgery. After the viable organ (or the formed stump after resection) is successfully placed back into the abdominal cavity, the operation is concluded in a standard manner. Hernia orifice repair is performed, just like in regular uncomplicated hernias, to prevent disease recurrence.
Briefly: answers to topical questions
What types of hernia incarceration exist according to the mechanism of occurrence?
The presented materials describe the general mechanism of content compression in the orifice and distinguish the following types of incarceration:
- Parietal incarceration (Richter's hernia) — only part of the bowel wall is compressed (usually the antimesenteric border), while the lumen may remain partially patent.
- Retrograde incarceration (W-shaped) — two viable loops are inside the hernia sac, while the connecting loop between them is located in the abdominal cavity and becomes necrotic due to compression of the common mesentery.
The mechanism of incarceration itself consists of organ compression in the hernia orifice, which leads to venous stasis, edema, circulatory impairment, and the inability to reduce it.
What is parietal incarceration (Richter's hernia) and why might the clinical presentation of acute intestinal obstruction be absent?
Parietal incarceration (Richter's hernia) is a type of incarceration in which only a portion of the bowel wall, usually the antimesenteric border, is trapped in a narrow hernia orifice.
With this type of incarceration, the bowel lumen may remain partially patent, so intestinal transit can be preserved. This is characteristic of narrow hernia orifices, including umbilical, epigastric, and femoral hernias; preserved patency complicates diagnosis.
The rule of resection margins for the bowel: «The afferent loop suffers twice as much». Therefore, we measure back 30–40 cm on the afferent loop, and twice as little (15–20 cm) on the efferent loop.
Class and exam questions
Why is it forbidden to divide the hernia orifice first in an incarcerated hernia?
If the ring is divided first, the necrotic bowel loop may uncontrollably slip back into the abdominal cavity. This will lead to the development of severe peritonitis.
What is retrograde incarceration?
This is a form of incarceration in which two viable loops are in the hernia sac, and the intermediate, non-viable loop hides in the abdominal cavity. This is precisely why thorough inspection of adjacent segments is necessary.
Do you keep the incarcerated omentum if it looks viable?
No, unlike the intestinal wall, the incarcerated segment of the greater omentum is always subject to mandatory resection, as the risk of its subsequent necrosis and infection is too high.
What else to study on this topic
- Mechanisms of formation and toxicity of «herniated water».
- Variants and techniques of hernia orifice repair at the final stage.
- Technique of creating an entero-enteral anastomosis after bowel loop removal.
- Pathogenesis of ischemic changes in the afferent loop (afferent loop).
Master the complete topic in the "Topographic Anatomy" course
This is a summary. The course covers everything tested in classes and exams.
- Complete study guide on «Hernioplasty for incarcerated hernias» and another 2,777 pages of the subject
- Assignments and quizzes after every topic — just like in a colloquium
- AI tutor answers questions on the topic anytime
- 91 video lessons on the subject
Other topics in the section «Surgery for Abdominal Wall Hernias»
Free video lessons: topographic anatomyShort lessons with study notes — no registration required.
Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.